According to one of Fords websites : For the 1.6 liter / 98 cubic inch four cylinder engine in a 1991 Mercury Capri ( the spark plug gap is .044 inch )
( .054 inch ) for the 3.8 liter V6 and the 5.0 liter V8 according to ford parts . com
The 1991 Mercury Marquis spark plug gap is .034. Most spark plugs will be pre-gapped by the spark plug manufacturer.
The spark plug wires fire in the 1, 3, 4, 2 order on the 1991 Mercury Topaz GS 2.3 engine. This is the most common engine type for this vehicle.Ê
The 3.8 liter V6 engine in a 1991 Mercury Cougar has a timing CHAIN
The correct spark plug for the 1991 model, 200 hp Mercury outboard, is a NGK brand, BU8H.
Computer is toast
Your 1991 Mercury Topaz 2.3 liter has a timing CHAIN
If it is a 3.0 liter V6 EFI. Then it will be .044
.050 inch , according to fordparts.com
mixed spark plug wires
According to one of Fords websites : For a 1991 LTD Crown Victoria : The 5.0 liter / 302 cubic inch V8 spark plugs are gapped at ( .050 inch ) The 5.8 liter / 351 cubic inch V8 spark plugs are gapped at ( .044 inch )
If your Mercury Grand Marquis is a 1991 model or older . The 5.0 liter / 302 and the 5.8 liter / 351 has the distributor at the front of the engine The distributor rotor turns COUNTERCLOCKWISE
1.9 liter ( .054 inch ) 1.8 liter ( .044 inch ) According to ford parts.com
According to one of Fords websites : For a 1991 Ford Explorer , 4.0 liter V6 engine : ( the spark plugs are gapped at .054 inch )
On my ( 1991 ) Ford Mustang 5.0 liter the spark plug gap was ( .054 inch ) What year of Ford Mustang ?
For a Mercury / Ford 3.0 liter V6 engine : ( the distributor rotor turns CLOCKWISE )
It is 27 foot-pounds.
For a 1991 LTD Ford Crown Victoria : According to one of Fords websites : For the 5.0 liter / 302 cubic inch V8 engine ( .050 inch spark plug gap ) For the 5.8 liter / 351 cubic inch V8 engine ( .044 inch spark plug gap )
Your local autozone can tell you. If they can't ask for spark plus for a 1988 Ford Thunderbird with a 5.0 engine.
The 4.9 liter ( 300 cubic inch ) straight 6 cylinder has ( 6 ) spark plugs The 5.0 liter ( 302 cubic inch ) and the 5.8 liter ( 351 cubic inch ) V8 engines have ( 8 ) sparkplugs
According to one of Fords websites : For a 1991 Ford Escort : 1.9 liter four cylinder engine ( the spark plugs are gapped at .054 inch ) 1.8 ( .044 inch )